Add version information and schema identifier to Python wrapper

src/ifcopenshell-python/ifcopenshell/__init__.py

@@ -141,3 +141,6 @@ def create_entity(type,*args,**kwargs):
 	for idx, arg in attrs: e[idx] = arg
 	return e
 
+
+version = ifcopenshell_wrapper.version()
+schema_identifier = ifcopenshell_wrapper.schema_identifier()

src/ifcwrap/IfcParseWrapper.i

@@ -200,4 +200,12 @@ namespace IfcUtil {
 		f->Init(s);
 		return f;
 	}
+
+	const char* const schema_identifier() {
+		return IfcSchema::Identifier;
+	}
+
+	const char* const version() {
+		return IFCOPENSHELL_VERSION;
+	}
 %}